Erinevus lehekülje "Itx8071-task2" redaktsioonide vahel

Redaktsioon: 23. august 2022, kell 13:05

To be announced.

@@ 1. rida: / 1. rida: @@
-This homework assignment requires the knowledge from Modules 6 and 7.
+To be announced.
-==== Create SEC rules that accomplish the following event correlation task: ====
-'''1) Monitor sshd log events for SSH probing of non-existing user accounts, and detect non-existing user accounts that have been probed over SSH from 3 distinct IP addresses within 60 seconds.'''
-For example, suppose the following events appear in the log:
- Nov  1 12:53:11 myhost sshd[10477]: Failed password for invalid user admin2 from 10.3.6.22 port 50087 ssh2
- Nov  1 12:53:12 myhost sshd[10477]: Failed password for invalid user admin2 from 10.3.6.22 port 50087 ssh2
- Nov  1 12:53:39 myhost sshd[10479]: Failed password for invalid user oracle from 10.3.6.24 port 9899 ssh2
- Nov  1 12:53:40 myhost sshd[10479]: Failed password for invalid user oracle from 10.3.6.24 port 9899 ssh2
- Nov  1 12:53:55 myhost sshd[10499]: Failed password for invalid user oracle from 10.2.9.99 port 6133 ssh2
- Nov  1 12:54:01 myhost sshd[10527]: Failed publickey for invalid user admin2 from 10.1.2.52 port 40106 ssh2
- Nov  1 12:54:02 myhost sshd[10527]: Failed publickey for invalid user admin2 from 10.1.2.52 port 40106 ssh2
- Nov  1 12:54:07 myhost sshd[10543]: Failed password for invalid user admin2 from 10.17.8.9 port 32444 ssh2
-When above events appear, SSH probing for non-existing user admin2 should be reported, since this user was probed between 12:53:11 and 12:54:07 from 3 distinct IP addresses 10.3.6.22, 10.1.2.52 and 10.17.8.9. However, SSH probing for non-existing user oracle should not be reported, since this user was probed from only 2 distinct IP addresses.
-Also note that the detection should be done with a sliding window approach -- if the counting operation for some non-existing user has not seen enough events during 60 seconds, the 60 second detection window should be moved forward.
-'''2) If the previous condition has been detected for 3 distinct non-existing users during 900 seconds (for example, admin2, oracle and testuser3 have been probed within 900 seconds), report this event to the local root-user via e-mail. After an e-mail has been sent, ensure than no repeated e-mails are generated during the following 3600 seconds.'''
-==== Some hints for accomplishing this assignment: ====
-* don't try to solve the whole assignment with just one rule, but rather write several rules which interact,
-* if SSH probing for some non-existing user account is detected (as described in the first subtask), you could generate a relevant synthetic event for this user, in order to provide input for further event correlation rules.
-* all parts of the solution must be fully functional even when several non-existing user accounts are probed from several hosts in parallel (for example, contexts maintained by different counting operations must not interfere with each other).
-Apart from studying the examples from the course slides, have a look at the SEC man page (installed at the virtual machines or found at https://simple-evcorr.github.io/man.html).

Erinevus lehekülje "Itx8071-task2" redaktsioonide vahel

Redaktsioon: 23. august 2022, kell 13:05

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